Company Replaces previous document Document ID Issue E.ON Elnät Sverige AB Ny engelsk utgåva D
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1 Document type Page Verksamhetsstyrande 1 (5) Company Replaces previous document Document ID Issue E.ON Elnät Sverige AB Ny engelsk utgåva D Organisation Valid from Valid until Regionnätsaffärer Responsible for the document Secrecy class Approved by Claes Ahlrot Öppen Roger Appelberg Title Technical requirements Insulators and accessories 1 General Scope Standards Changes relative to previous issue Electrical and mechanical requirements Suspended and dead-end insulator assemblies Attachment of suspension and tension insulators Fitting components Suspension clamps Tension clamps Tension insulators Suspension insulators Arcing horn Post insulators Transposition insulators General Insulation Fitting components Arcing horn Appendix...5
2 E.ON Elnät Sverige AB Verksamhetsstyrande 2 (5) 1 General 1.1 Scope These requirements cover the general demands of E.ON Elnät Sverige AB in respect of post insulator, insulator assemblies and insulator accessories. The requirements applies to the design voltage kv, rated frequency 50 Hz for indoor or outdoor designs. The requirement does not apply to EBR designs that have a 52 kv design voltage. These requirements are a translation from the Swedish requirements D If the content of this document differs from the Swedish version, the Swedish requirements shall prevail. For insulators also refer to: NUT Technical specification for Glass insulators NUT Technical specification for Composite Longrod-Insulators For splices refer to: D Teknisk bestämmelse Utförande av skarvar D Teknisk bestämmelse Skruvade klämmor 1.2 Standards Post insulators, insulator assemblies and accessories must be designed, manufactured and tested in accordance with the most recent edition of applicable standards. In the event of disparities between this document and the relevant standard, these Technical Regulations shall apply. 2 Changes relative to previous issue Appendix 3 is updated. Changes from the previous issue are marked with a vertical line in the right-hand margin. 3 Electrical and mechanical requirements For overhead lines insulators, the requirements according to SS-EN shall apply. For all insulators in a station including insulators located from the tension pole in to the station, the requirements of SS shall apply. 3.1 Suspended and dead-end insulator assemblies Attachment of suspension and tension insulators Suspension and tension insulators must be attached to supporting structural parts with suspension linkage made according to DIN
3 E.ON Elnät Sverige AB Verksamhetsstyrande 3 (5) 1 and with drainage link made according to DIN Connection bolts must be provided with nuts and scissors according to DIN Form S. See Appendix 1. No other types of connectors, type smooth bolt, self-locking nuts etc, may occur in E.ON's regional wires Fitting components Fitting components shall be designed using hot-dip galvanized steel and withstand a minimum of 40 ka for one second. This generally applies for all voltages from 40 kv 130 kv. Material thickness shall be at least 10 mm. A permitted short-time withstand current of 70 A/mm 2 applies for mechanically loaded steel fittings included in insulator assemblies. While 80 A/mm 2 applies for arcing horns Suspension clamps Suspension clamps for FeAl and Al-alloyed conductors shall be of the type AGS with a 22 mm bolt. A 20 mm bolt is permitted for conductors with a cross section of mm 2. For existing conductors with areas smaller than 234 mm 2, a 16 mm bolt can be used Tension clamps Wedged tension clamps shall always be used. Bolted tension clamps shall be used in stations where there is loose stress in the conductor. The fixing bolt diameter should be 22 mm for lines with a range of 241 mm 2. For conductors up to 241 mm 2 a 19 mm bolt is allowed Tension insulators Tension insulators should be made with glass insulators or composite insulators. Splicing of conductors using parallel clamps shall be carried out on the strain relieved side of the tension clamp and must not be done on the tensioned conductor. The spacing between the clamp s strain relieved side and the first parallel clamp shall be at least 1.0 metre. All connecting bolts shall have a diameter of 22 mm. Regardless of glass or composite, insulators must be constructed in principle according to sketches. 50 kv assemblies shall be designed in principle according to Sketch 1, Appendix kv assemblies shall be designed in principle according to Sketch 2, Appendix 3. Parts according to the sketches 1 and 2 can be replaced by equivalent parts from another manufacturer.
4 E.ON Elnät Sverige AB Verksamhetsstyrande 4 (5) Suspension insulators Suspension insulators should be made with glass insulators or composite insulators. 50 kv suspension insulators shall be designed in principle according to Sketch 3, Appendix kv assemblies shall be designed in principle according to Sketch 4, Appendix 5. Parts according to the sketches 3 and 4 can be replaced by equivalent parts from another manufacturer. All connecting bolts shall have a diameter of 22 mm Arcing horn Arcing horns shall withstand 40 ka for 1 second. Insulator assemblies in lines built for class A shall always be equipped with arcing horns. Tension insulators in the span, with loose stress in the conductor, from the tension pole into the switchgear must always be fitted with arc wires. This means that all spans that pass over a station fence should have arcing horns in the insulator chain. Other tension chains in a station do not need arcing horns. Arcing horns shall be of the fork ring type or one-way ring type. The tips of the arcing horn shall be directed upwards in the tension insulator and in suspension insulator mounted in the angle supports. In tangent supports with suspension assemblies, the tips at the outer phases shall point out from the support. Arcing horns shall be mounted using double bolts with at least 12 mm bolts. Nuts shall be locked with locking strips or double punch marks. 3.2 Post insulators Post insulators shall be of a composite type with a casing and shields of silicon rubber. Post insulators type Line Post shall be equipped with rocker clamps on top where the line shall be equipped with a protective winding. 3.3 Transposition insulators General It must be ensured that the free conductor length between the dead-end clamp s strain relieved side and the first parallel clamp shall be at least 1.0 metre for the installation of dead-end clamps on the transposition isulators. The transposition insulators can be designed using different materials in the insulating part according to this requirements Insulation SS-EN applies for insulation between phases.
5 E.ON Elnät Sverige AB Verksamhetsstyrande 5 (5) Fitting components See Fitting components Arcing horn For dimensioning see Arcing horn. The transposition insulators shall be equipped with rotating clevis links so it is possible to turn the insulator assembly in relation to the tension clamp so that the tips of the arcing horn point straight upwards. 4 Appendix Appendix 1 - Bolts with nuts and split pin in accordance with DIN Appendix 2 - Sketch 1 50 kv dead-end insulator assembly Appendix 3 - Sketch kv dead-end insulator assembly Appendix 4 - Sketch 3 50 kv suspension insulator assembly Appendix 5 - Sketch kv suspension insulator assemb
6 E.ON Elnät Sverige AB Bilaga 1 Claes Ahlrot (1) D
7 E.ON Elnät Sverige AB Bilaga 2 1 (1)
8 E.ON Elnät Sverige AB Bilaga 3 1 (1)
9 E.ON Elnät Sverige AB Bilaga 4 1 (1)
10 E.ON Elnät Sverige AB Bilaga 5 1 (1)
Notes Changed note Date. 1 (A) Changed template 09 / 07 / 2008
Revisions Notes Changed note Date 1 (A) Changed template 09 / 07 / 2008 2 Changed template. Clause 12.5.4.1 hot-rolled steel added. Clause 12.5.4.2, 12.5.2.4, 12.5.3.4, 12.5.4.4, 12.5.5.4, 12.5.6.4, 12.5.7.4
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